88 BULLETIN BO, UNITED STATES NATIONAL MUSEUM 



1913, 39 (Wyoming; common in south). — Rockwell and Wetmork, Auk, xxxi, 



1914, 314 (Lookout Mountain, Colo.).— Swarth, Pacific Coast Avif., No. 10, 

 1914, 22 (Arizona; White Mountains, San Francisco Mountains). — Over and 

 Thoms, Birds South Dalcota, 1921, 75 (Black Hills) .—Jensen, Auk, xi, 1923, 

 454 (n. Santa Fe County, N. Mex., 9,000 feet to timberline).— Wyman and 

 BuRNELL, Field Book Birds Southwestern United States, 1925, 88 (descr.).— 

 SwARTH, Univ. California Publ. Zool., xxx, 1926, 79 in text (fig. of tail 

 feathers), 84 in text.— Neilson, Condor, xxviii, 1926, 99 (Wheatland, Wyo.).— 

 Bailey, Birds New Mexico, 1928, 196 (genl.. New Mexico).— Brooks, Auk, 

 xlvi, 1929, HI (crit., tax., syn.).— Hay ward, Proc. Utah Acad. Sci., viii, 

 1931, 151 (Uintah Mountains, Utah).— Bent, U. S. Nat. Mus. Bull. 162, 1932, 

 91 (habits, distr., etc.).— Peters, Check-list Birds of World, ii, 1934, 29 

 (distr.).— McCreary and Mickey, Wils. Bull., xlvii, 1935, 129 in text (se. 

 Wyoming, res.).— Linsdale, Pacific Coast Avif., No. 23, 1936, 23, 47 (Nevada; 

 res. on several mountain ranges in ne. part of State). — Huey, Wils. Bull, xlviii, 

 1936, 122 (White Mountains, Ariz. ; nest. ; not uncommon). — Alexander, Univ. 

 Colorado Studies, Zool., xxiv, 1937, 91 (Boulder County, Colo.; spec). — Phil- 

 lips, Auk, liv, 1937, 203 in text (8 miles se. Lukachukai, Apache Country, Ariz. ; 

 8,800 feet; pair seen) .— Moffitt, Auk, Iv, 1938, 589, pi. 17, fig. 1 (downy young; 

 col. fig.). — Niedrach and Rockwell, Birds Denver and Mountain Park, 1939, 59 

 (Denver area, Colo.). — Bond, Condor, xlii, 1940, 220 (Lincoln County, Nev. ; 

 Wilson Peak, 8,000-8,500 feet; also Geyser Ranch, 8,000-9,000 feet).— Hell- 

 MAYR and CoNOVER, Cat. Birds Amer., i. No. 1, 1942, 198 (syn.; distr.). — Behle, 

 Bull. Univ. Utah, xxxiv. No. 2, 1943, 24, 37 (Pine Valley Mountain Region, 

 Washington County, Utah) ; Condor, xlvi, 1944, 71 (Utah). 



Dendragapus oibscurusl obscurus Lincoln, Auk, xxxvii, 1920, 65 (Clear Creek 

 district, Colorado; late summer and full). — Stanford, Proc. Utah Acad. Sci., 

 ix, 1932, 7i (n. Utah; Mill Hollow) .—Groebbels, Der Vogel, ii, 1937, 166 

 (data on breeding biology). 



Dlendragapus] olbscurus] obscurus Swarth, Univ. California Bubl. Zool., xxx, 

 1926, 74 in text (map; distr.). 



Tlympanuchus] obscurus Reichenow, Die Vogel, i, 1913, 320. 



DENDRAGAPUS OBSCURUS PALLIDUS Swarth 



Swarth's Dusky Grouse 



Adult male. — Very similar to that of Dendragapus obscurus richard- 

 sonii but averaging slightly paler above and below and with the under 

 tail coverts averaging paler — chaetura drab (instead of fuscous-black) — 

 and with broader white tips. 



Adult female. — ^Very similar to that of D. o. richardsonii but with paler 

 under tail coverts — grayish banded with chaetura drab (instead of solid 

 fuscous-black) — ^and with broader white tips. 



Immature male. — Like the adult male but with narrower rectrices, 

 more graduated tail, and often some juvenal feathers remaining on head 

 and wings. 



Iminature female. — Like the adult female but with narrower rectrices, 

 more graduated tail, and often some juvenile feathers remaining on head 

 and wings. 



